#include<stdio.h>
int add(int top)
{
	int ret =0;
	for(int i=0;i<=top;i++)
	{
		ret+=i;
	}
	return ret;
}
int main()
{
	printf("debug begin:\n");

	int top =100;
	int sum =add(top);
	printf("sum = %d\n",sum);

	printf("debug end\n");
	return 0;
}
